| a. | 1. | Free from harm; unhurt; |
| 2. | Free from power or disposition to harm; innocent; inoffensive. |
| Adj. | 1. | harmless - not causing or capable of causing harm; "harmless bacteria"; "rendered the bomb harmless" Antonyms: harmful - causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking" |
| 2. | harmless - not injurious to physical or mental health Synonyms: innocuous | |
| 3. | harmless - not producing any toxic effects | |
| 4. | harmless - unlikely to harm or disturb anyone; "harmless old man" Synonyms: innocuous | |
| 5. | harmless - not threatening to life or health; not malignant; "a benign tumor is usually harmless" Synonyms: nonmalignant |